Does it take more effort to swim in the deep end of a pool than the shallow end? - BBC Science Focus Magazine

Floating in the deep: why do freedivers push themselves to the verge of death?, Extreme sports

Why does a swimming pool apparently appear to be shallow? - Quora

The Devil's Teeth: A True Story of Obsession and Survival Among America's Great White Sharks: Casey, Susan: 9780805080117: : Books

vmrw8k5h.tinifycdn.com/news/wp-content/uploads/201

Tanya Streeter Redefines Limits—Her Own and Yours Austin Fit Magazine – Inspiring Austin Residents to Be Fit, Healthy, and Active

How long could you live submerged up to your chin in water? - BBC Science Focus Magazine

Beneath the Surface: A Peek at Private Pools - The New York Times

Why does a swimming pool apparently appear to be shallow? - Quora

Divers for the Environment June 2017 by Divers for the Environment - Issuu

Quest Magazine Vol 12 No 3 by assaf3 - Issuu

Is it easier to swim in deep or shallow calm water, or are these the same? - Quora

From the Depths: Re-Learning How to Breathe - San Diego Magazine

vmrw8k5h.tinifycdn.com/news/wp-content/uploads/201

Good Science Victorian Curriculum Year 7